KRÁLÍK, Miroslav, Adela HUPKOVÁ, Tomáš ZEMAN, Martin HLOŽEK, Lukáš HLAVÁČEK, Marie SLOVÁČKOVÁ, Martin ČUTA and Petra URBANOVÁ. Family effects on the digit ratio (2D:4D): The role of the interbirth interval. American Journal of Human Biology. Hoboken: Wiley, 2019, vol. 31, No 4, p. 1-19. ISSN 1042-0533. doi:10.1002/ajhb.23260.
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Basic information
Original name Family effects on the digit ratio (2D:4D): The role of the interbirth interval
Authors KRÁLÍK, Miroslav (203 Czech Republic, guarantor, belonging to the institution), Adela HUPKOVÁ (703 Slovakia, belonging to the institution), Tomáš ZEMAN (203 Czech Republic, belonging to the institution), Martin HLOŽEK (203 Czech Republic, belonging to the institution), Lukáš HLAVÁČEK (203 Czech Republic), Marie SLOVÁČKOVÁ (203 Czech Republic, belonging to the institution), Martin ČUTA (203 Czech Republic, belonging to the institution) and Petra URBANOVÁ (203 Czech Republic, belonging to the institution).
Edition American Journal of Human Biology, Hoboken, Wiley, 2019, 1042-0533.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10700 1.7 Other natural sciences
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
WWW Full Text
Impact factor Impact factor: 1.558
RIV identification code RIV/00216224:14310/19:00107449
Organization unit Faculty of Science
UT WoS 000474705000011
Keywords in English siblings; birth order; interbirth interval; 2D:4D ratio; prenatal programming
Tags rivok
Tags International impact, Reviewed
Changed by Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 28/1/2020 09:39.
Objectives Family represents the closest social environment that immediately affects human ontogeny from an early prenatal period. This study aimed to assess sibship influences on the second-to-fourth digit length ratio (2D:4D ratio). Methods The source sample represented 329 children aged 6.5 to 15.8 years (Czech Republic), including a subsample of 75 sibling pairs. A combination of (a) between-family design (cross-sectional sample) and (b) within-family design (pairs of siblings) was used to study the effect of family variables and interbirth interval (IBI) on the 2D:4D ratio. Results Birth order, number of siblings (except for younger sisters), and sex ratio in siblings were significantly related to the 2D:4D ratio on the right, left, or both hands. At the same time, the relationships were opposite in males and females for birth order, number of older brothers and number of children in the family-increasing values in these variables increased digit ratio in males but decreased digit ratio in females. Mean difference in 2D:4D ratio (DIFF) within pairs (older minus younger sibling) differed from zero only in the “older sister-younger brother” group, where DIFF did not depend on IBI. On the contrary, in remaining pair types the DIFF tended to change with IBI, the strongest in the “older brother-younger sister” pairs. Conclusions Family variables, especially number of older brothers, should be considered as important confounding factors in 2D:4D ratio studies. However, the effect of these variables might be modified by IBI.
GP305/05/P303, research and development projectName: Sexuální dimorfismus a dědičné založení tvaru lidské ruky
Investor: Czech Science Foundation, Sexual dimorphism and genetic background of human hand shape
MUNI/A/1400/2018, interní kód MUName: Rozvoj aplikačního potenciálu morfologických znaků obličeje člověka
Investor: Masaryk University, Category A
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